# B vs U

The clearest difference is in-app purchases: B at none against U's 7. B also leads on iOS requirement (8.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. U sells 7 in-app purchases, starting at $2.99 per month. B asks for nothing beyond the download.

## The numbers

| Metric | B | U |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 1 MB | 74 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [增宝 王](https://appshunter.io/developer/827650044) | [Alejandro Platas Mallo](https://appshunter.io/developer/1896316102) |

## What reviewers say

### B

[App page](https://appshunter.io/ios/app/b-tree-binary-tree/id1064830420)

**Features:** macOS Compatibility

**In-app purchases:** none


### U

[App page](https://appshunter.io/ios/app/u-manager-for-unraid/id6766693828)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| U-Manager All Access (Monthly) | $2.99 | per month |
| U-Manager All Access (Annual) | $12.99 | per year |
| Tautulli | $1.99 | one-time |
| Torrent | $2.49 | one-time |
| SSH | $3.49 | one-time |
| File browser | $4.49 | one-time |
| Power Pack | $6.99 | one-time |


## Frequently asked questions

### Is B free?

B is free to download, with no in-app purchases.

### Is U free?

U is free to download, with in-app purchases available.

### Do B or U have ads?

Neither B nor U shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*